What Is CAS Latency?


Quick Answer

CAS latency is the count of how many clock cycles pass between the release of an instruction for a column of data in RAM to when the data becomes available. A lower CAS latency number is typically better, though the figures are limited within a particular memory technology type.

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Full Answer

In a RAM memory formatted in DDR, for example, the available CAS latency cycles are limited between 2.5 and 3. DDR2 memory chips, on the other hand, can have a CAS latency count between three to six cycles. CAS latency can also be specified in nanoseconds, though this only applies for an asynchronous DRAM memory system.

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